<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>4.声明栅格系统的容器,</title>
  <style>
    article {
      width: 300px;
      height: 100px;
      border: solid 5px silver;
      display: inline-grid;
      grid-template-rows: 50% 50%;
      grid-template-columns: 20% 20% 20% 20% 20%;
    }
/* 元素的宽高不指定，会充满整个单元格， 若大小不到单元格的大小，会留出空隙，但是单元格的大小不会变*/
    div {
      width: 50px;
      height: 50px;
      background-color: blueviolet;
      background-clip: content-box;
      border: solid 1px blueviolet;
      padding: 10px;
      box-sizing: border-box;
    }
  </style>
</head>
<body>
  后盾人
  <article>
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
    <div>6</div> 
    <div>7</div>
    <div>8</div>
    <div>9</div>   
  </article>
</body>
</html>